Magento 2: How to add block inside block html content through XML file

Question

I have created my custom arithmetic captcha. I want add that captcha to my custom form through xml file without defining in phtml file on custom layout. For example:

Testimonail submit form: testimonial_form.phtml file contains

  <form name="testimonial" action="testimonial/post/index" method="post">

 <input type="text" name="name" />
 <!--  I want captcha here through XML --!-->

<input type="submit" value="submit" />  
</form>  

I want to add my custom captcha through xml before th submit button. How can i do that?

Any help would be appreciated.

Answer 1

Create a container for that. You can check here, how to create that

Now you can use it inside your phtml:

<?= $block->getChildHtml('form.additional.info') ?>

Your configuration is done. Now you can add separate XML with name form.additional.info for captcha.